[Rd] Method dispatch fails for autoloaded methods (PR#642)

[Thomas Lumley]

On Thu, 24 Aug 2000 maechler@stat.math.ethz.ch wrote:

> (As mentioned before, on R-devel)
> 
> This code snippet shows what the Subject above says :

The problem is that isFunction is false for diff.ts, since it is only a
promise, not a function.

I think the solution is for usemethod to force the promise (in lines 225ff
of objects.c), but I'm not sure how to do this.

	-thomas

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